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Chinese scientists hack military grade encryption on quantum computer: paper (www.scmp.com)

submitted 1 month ago by floofloof@lemmy.ca to c/technology@lemmy.world

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[–] Smilezz@lemmy.world 2 points 1 month ago (1 children)

AES works with a shared key. This won't work when you want to have an encrypted connection with a webshop (how would you get the key over there in a secure way?). For this you have asynchronous key algorithms such as RSA en ECDH. These algorithms can make a secure connection without anything preshared. Usually this is used to compute a shared key and then continue over AES. These asynchronous algorithms are at risk of being cracked with quantum computers.

[–] Rin@lemm.ee 1 points 1 month ago

My point is that AES isn't untouched by quantumn computing. We now have quantumn safe asymmetric key encryption, too.

Grover's algorithm gives broad asymptotic speed-ups to many kinds of brute-force attacks on symmetric-key cryptography.

Source: https://en.m.wikipedia.org/wiki/Grover's_algorithm#Cryptography